:root {
    --pibg-dark: #111111;
    --pibg-light: #f7f3ed;
    --pibg-text: #151515;
    --pibg-muted: #6a665f;
    --pibg-line: #ded8cd;
    --pibg-accent: #ffffff;
    --pibg-serif: 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', 'Noto Serif TC', serif;
    --pibg-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
    --container: min(1280px, calc(100% - 72px));
    --container-narrow: min(900px, calc(100% - 72px));
    --transition: 280ms ease;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--pibg-text);
    background: var(--pibg-light);
    font-family: var(--pibg-sans);
    line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.site-main { overflow: clip; }
.site-container { width: var(--container); margin-inline: auto; }
.narrow-container { width: var(--container-narrow); margin-inline: auto; }
.section-divider { border-top: 1px solid var(--pibg-line); }
.section-spacer-top { margin-top: 56px; }
.stack-lg > * + * { margin-top: 32px; }
.center-actions { display: flex; justify-content: center; margin-top: 24px; }
.align-center { text-align: center; }

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-family: var(--pibg-serif);
    font-weight: 500;
    letter-spacing: -0.03em;
    line-height: 1.05;
}
p { margin: 0 0 1.1em; }

.eyebrow {
    margin: 0 0 18px;
    color: var(--pibg-muted);
    font-size: 11px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
}
.eyebrow--light { color: rgba(255,255,255,.72); }
.section-title,
.page-title-large,
.hero__title { font-size: clamp(2.8rem, 6vw, 6rem); }
.section-desc, .page-hero__text, .hero__text, .archive-card__content p, .prose-content { color: var(--pibg-muted); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid transparent;
    backdrop-filter: blur(18px);
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.site-header.is-scrolled.site-header--on-light,
.site-header.site-header--on-light { background: rgba(247,243,237,.92); border-color: var(--pibg-line); }
.site-header.is-scrolled.site-header--on-dark,
.site-header.site-header--on-dark { background: rgba(17,17,17,.86); border-color: rgba(255,255,255,.08); }
.site-header__inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.site-title,
.site-footer__brand {
    font-size: 13px;
    letter-spacing: 0.35em;
    text-transform: uppercase;
}
.site-logo img { width: auto; max-height: 38px; }
.primary-navigation ul,
.footer-navigation ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    gap: 22px;
    align-items: center;
}
.primary-navigation a,
.footer-navigation a {
    position: relative;
    display: inline-flex;
    padding: 8px 0;
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}
.primary-navigation .current-menu-item > a::after,
.primary-navigation .current_page_item > a::after,
.primary-navigation .current-page-ancestor > a::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 1px;
    background: currentColor;
}
.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: pointer;
}
.menu-toggle__line {
    display: block;
    width: 22px;
    height: 1px;
    margin: 5px auto;
    background: currentColor;
    transition: transform var(--transition), opacity var(--transition);
}

.hero {
    position: relative;
    color: var(--pibg-accent);
    background:
        radial-gradient(circle at 50% 40%, rgba(255,255,255,.08), transparent 35%),
        radial-gradient(circle at 75% 35%, rgba(255,255,255,.05), transparent 28%),
        linear-gradient(180deg, rgba(17,17,17,.96), rgba(17,17,17,1));
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--hero-image);
    background-size: cover;
    background-position: center;
    opacity: .12;
    mix-blend-mode: screen;
}
.hero__inner {
    position: relative;
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: flex-end;
    padding: 144px 0 72px;
}
.hero__content { max-width: 620px; position: relative; z-index: 2; }
.hero__text { font-size: 1rem; max-width: 620px; color: rgba(255,255,255,.74); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.hero__bg-word {
    position: absolute;
    inset: 50% auto auto 50%;
    transform: translate(-50%, -55%);
    font-family: var(--pibg-serif);
    font-size: clamp(6rem, 20vw, 18rem);
    letter-spacing: -0.08em;
    color: rgba(255,255,255,.035);
    white-space: nowrap;
    pointer-events: none;
}
.hero__scroll {
    position: absolute;
    right: 0;
    bottom: 72px;
    font-size: 10px;
    letter-spacing: 0.3em;
    transform: rotate(90deg) translateY(-50%);
    transform-origin: right bottom;
    color: rgba(255,255,255,.56);
}
.page-hero--light {
    background: var(--pibg-light);
    border-bottom: 1px solid var(--pibg-line);
}
.page-hero__inner { padding: 96px 0 56px; }
.page-hero__text { max-width: 760px; }
.meta-inline { display: flex; flex-wrap: wrap; gap: 18px; color: var(--pibg-muted); font-size: .95rem; }

.page-section { padding: 72px 0; }
.split-layout,
.feature-banner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 72px;
    align-items: start;
}
.split-layout--content { gap: 64px; }
.split-layout--character { align-items: center; }
.split-layout--compare { align-items: center; }
.section-image-frame {
    background: linear-gradient(180deg, rgba(17,17,17,.08), rgba(17,17,17,.03));
    border: 1px solid var(--pibg-line);
    min-height: 420px;
    display: flex;
    align-items: stretch;
}
.section-image-frame img,
.archive-card__image img,
.feature-banner__image img,
.split-layout__media img { width: 100%; height: 100%; object-fit: cover; }

.number-grid,
.card-grid,
.facts-grid,
.info-grid,
.service-grid {
    display: grid;
    gap: 28px;
}
.number-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card-grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card-grid--projects { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.facts-grid, .info-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.service-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.number-card,
.archive-card,
.fact-card,
.service-card,
.post-card,
.contact-card,
.compare-board,
.feature-banner,
.dual-feature__item,
.timeline-item,
.compare-board__cell {
    border: 1px solid var(--pibg-line);
    background: rgba(255,255,255,.35);
}
.number-card,
.fact-card,
.service-card,
.contact-card,
.post-card,
.compare-board__cell { padding: 26px; }
.number-card__index {
    display: block;
    margin-bottom: 18px;
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--pibg-muted);
}
.number-card h3,
.service-card h3,
.archive-card h3,
.feature-banner h3 { font-size: clamp(1.3rem, 2.3vw, 2rem); margin-bottom: 12px; }

.dual-feature { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.dual-feature__item { padding: 40px; min-height: 320px; display: flex; flex-direction: column; justify-content: flex-end; }
.dual-feature__item--dark { background: var(--pibg-dark); color: var(--pibg-accent); border-color: rgba(255,255,255,.08); }
.dual-feature__item p:last-of-type { margin-bottom: 24px; }

.archive-card__image { aspect-ratio: 4 / 5; display: block; background: rgba(17,17,17,.06); }
.archive-card--project .archive-card__image { aspect-ratio: 16 / 10; }
.archive-card__content { padding: 18px 22px 24px; }
.archive-card__meta,
.shop-price,
.fact-card__label,
.contact-card__label,
.timeline-item__period,
.brand-cloud span,
.detail-table span {
    font-size: 11px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--pibg-muted);
}
.fact-card__value { display: block; margin-top: 10px; font-size: 1.1rem; color: var(--pibg-text); }

.compare-board {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 0;
    overflow: hidden;
}
.compare-board__cell {
    min-height: 260px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 12px;
    border: 0;
}
.compare-board__cell--dark { background: var(--pibg-dark); color: var(--pibg-accent); }
.compare-board__cell span { font-size: 3rem; }
.compare-board__cell strong { font-family: var(--pibg-serif); font-size: 2rem; }
.compare-board__cell em { font-style: normal; color: inherit; opacity: .75; }

.character-subtitle { font-size: 1.2rem; color: var(--pibg-muted); margin: 16px 0 24px; }
.detail-table {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 24px;
    margin: 0 0 28px;
}
.detail-table strong { display: block; margin-top: 6px; font-weight: 600; color: var(--pibg-text); }

.brand-cloud { display: flex; flex-wrap: wrap; gap: 12px; }
.brand-cloud span { padding: 10px 14px; border: 1px solid var(--pibg-line); }

.timeline-list { display: grid; gap: 20px; }
.timeline-item {
    display: grid;
    grid-template-columns: 210px 1fr;
    gap: 24px;
    padding: 26px;
}
.timeline-item__body h3 { font-size: 1.8rem; margin-bottom: 12px; }
.quote-block {
    margin: 0;
    padding: 10px 0 10px 28px;
    border-left: 3px solid var(--pibg-text);
    font-family: var(--pibg-serif);
    font-size: clamp(1.4rem, 2.2vw, 2rem);
    line-height: 1.45;
    color: var(--pibg-text);
}
.feature-banner { padding: 26px; align-items: center; }
.contact-card__email { display: inline-block; margin-bottom: 24px; font-size: 1.2rem; }
.contact-card__form > * { margin-bottom: 0; }
.faq-list { display: grid; gap: 16px; }
.faq-item {
    border: 1px solid var(--pibg-line);
    padding: 22px 24px;
    background: rgba(255,255,255,.35);
}
.faq-item summary {
    cursor: pointer;
    list-style: none;
    font-family: var(--pibg-serif);
    font-size: 1.35rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item__body { margin-top: 16px; color: var(--pibg-muted); }
.prose-content > *:last-child { margin-bottom: 0; }
.prose-content h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); margin: 1.4em 0 .5em; }
.prose-content h3 { font-size: clamp(1.35rem, 2vw, 1.7rem); margin: 1.3em 0 .45em; }

.pibg-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 10px 24px;
    border: 1px solid currentColor;
    font-size: 11px;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    transition: opacity var(--transition), background var(--transition), color var(--transition), transform var(--transition);
}
.pibg-button:hover { opacity: .9; transform: translateY(-1px); }
.button-solid { background: var(--pibg-text); color: var(--pibg-accent); border-color: var(--pibg-text); }
.button-solid--light { background: rgba(255,255,255,.96); color: var(--pibg-text); border-color: rgba(255,255,255,.96); }
.button-outline { background: transparent; color: var(--pibg-text); }
.button-outline--light { color: var(--pibg-accent); border-color: rgba(255,255,255,.75); }

.site-footer {
    border-top: 1px solid var(--pibg-line);
    background: var(--pibg-light);
}
.site-footer__inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    padding: 32px 0 42px;
}
.site-footer__text,
.site-footer__links {
    color: var(--pibg-muted);
    font-size: .92rem;
}
.site-footer__links { display: flex; flex-wrap: wrap; gap: 16px; }

.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 1180px) {
    .number-grid,
    .facts-grid,
    .info-grid,
    .service-grid,
    .card-grid--three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .card-grid--projects { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
    :root { --container: min(100% - 40px, 1000px); --container-narrow: min(100% - 40px, 760px); }
    .menu-toggle { display: inline-block; }
    .primary-navigation {
        position: fixed;
        inset: 72px 0 auto 0;
        background: rgba(17,17,17,.98);
        color: #fff;
        padding: 16px 20px 28px;
        border-bottom: 1px solid rgba(255,255,255,.1);
        transform: translateY(-115%);
        transition: transform var(--transition);
    }
    .primary-navigation.is-open { transform: translateY(0); }
    .primary-navigation ul { display: grid; gap: 6px; }
    .primary-navigation a { padding: 14px 0; }
    .split-layout,
    .feature-banner,
    .dual-feature,
    .compare-board,
    .timeline-item,
    .site-footer__inner { grid-template-columns: 1fr; display: grid; }
    .hero__inner { min-height: 84vh; padding-top: 132px; }
    .hero__scroll { display: none; }
    .detail-table { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .page-section { padding: 54px 0; }
    .site-header__inner { min-height: 64px; }
    .hero__inner { padding: 118px 0 52px; }
    .hero__bg-word { font-size: 30vw; }
    .hero__actions,
    .center-actions { flex-direction: column; align-items: stretch; }
    .pibg-button { width: 100%; }
    .number-grid,
    .facts-grid,
    .info-grid,
    .service-grid,
    .card-grid--three,
    .card-grid--projects { grid-template-columns: 1fr; }
    .section-image-frame { min-height: 280px; }
    .archive-card__content { padding: 16px 18px 20px; }
    .dual-feature__item { min-height: 240px; padding: 28px; }
}